An updated and enlarged version of WarBirds is coming!
http://store.steampowered.com/app/433130/
WarBirds Dogfights 2016 includes an infinite variety of offline combats. Multiple friendly and enemy AI aircraft help you become a highly skilled WarBirds pilot. In addition, the game includes virtually all the features that makes WarBirds 2016 an online hit.
Check out the original WarBirds 2016 here:
http://store.steampowered.com/app/365620